C8 - Rates of Reaction

Question 1

Equations to show how the rate of a chemical reaction can be found. Mean Rate of Reaction =

Answer 1

quantity of reactant used
_____________________
time taken

quantity of product formed
_____________________
time taken

Question 2

2 ways the quantity of reactant or product can be measured

Answer 2

1. Mass in grams

2. Volume in cm3

Question 3

5 factors which affects the rates of chemical reactions

Answer 3

1. Concentration of reactants in solution
2. Pressure of reacting gasses
3. Surface area of solid reactants
4. Temperature
5. The presence of catalysts

Question 4

Explain how increasing the concentration of reactants and increasing the temperature increases
the rate of reaction

Answer 4

Increasing concentration of reactants increases frequency of collisions,
increasing temperature makes collisions more energetic therefore there will be an increased frequency of successful
collisions

Question 5

What is a catalyst and what does it do?

Answer 5

Changes the rate of chemical reactions without getting used up

Question 6

Example of a biological catalyst

Answer 6

Enzymes

Question 7

How do catalysts change reactions?

Answer 7

Provide a different pathway with lower activation energy